1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  *  SR-IPv6 implementation
4  *
5  *  Author:
6  *  David Lebrun <david.lebrun@uclouvain.be>
7  *
8  *
9  *  This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14 
15 #ifndef _UAPI_LINUX_SEG6_H
16 #define _UAPI_LINUX_SEG6_H
17 
18 #include <linux/types.h>
19 #include <linux/in6.h>		/* For struct in6_addr. */
20 
21 /*
22  * SRH
23  */
24 struct ipv6_sr_hdr {
25 	__u8	nexthdr;
26 	__u8	hdrlen;
27 	__u8	type;
28 	__u8	segments_left;
29 	__u8	first_segment; /* Represents the last_entry field of SRH */
30 	__u8	flags;
31 	__u16	tag;
32 
33 	struct in6_addr segments[];
34 };
35 
36 #define SR6_FLAG1_PROTECTED	(1 << 6)
37 #define SR6_FLAG1_OAM		(1 << 5)
38 #define SR6_FLAG1_ALERT		(1 << 4)
39 #define SR6_FLAG1_HMAC		(1 << 3)
40 
41 #define SR6_TLV_INGRESS		1
42 #define SR6_TLV_EGRESS		2
43 #define SR6_TLV_OPAQUE		3
44 #define SR6_TLV_PADDING		4
45 #define SR6_TLV_HMAC		5
46 
47 #define sr_has_hmac(srh) ((srh)->flags & SR6_FLAG1_HMAC)
48 
49 struct sr6_tlv {
50 	__u8 type;
51 	__u8 len;
52 	__u8 data[0];
53 };
54 
55 #endif
56